Device for grinding contact points



H. J. POOLE AND S. E. COUCH.

DEVICE FOR GRINDING CONTACT POINTS.

APPLICATION FILED MAY 24. I920.

1,436,436. Patented v. 21, 1922.

3 SHEETS -SHEET I.

myz,

INVENTORS, 61E. Caaciz md By Ed Poole,

A TTORAIE Y H. J. POOLE AND S. E. COUCH.

DEVICE FOR GRINDING CONTACT POINTS.

APPLICATION FILED MAY 24, 1920.

1,436,436, Patented NOV. 21, 1922.

3 SHEETSSHEET 2.

.1, :4 (I; k E

l' 2 i r E 3 INVENTORS, 131E. 601466, and BY HJ P00 Z6,

H. J. POOLE AND S. E. COUCH.

DEVICE FOR GRINDING CONTACT POINTS.

APPLICATION FILED MAY 24, I920.

1,43 ,43 Patented Nov. 21, 1922 3 SHEETS-SHEET 3.

INVENTORS, 151E. C 0uck,arid

H cl Poole,

A TTO'RNE Y Patented ov. 21, 1922.

Human a. POQLE AND STEPHEN E. CQUCHfOF SPRINGFIELD, MASSACHUSETTS;

1 SAID COUCH ASSIGNOR TO SAID POOLE.

V nnvrcn non cnmmne comncr rom rs.

Application flied May 24,

To all whom it may concern: j v

Beit known that we, HOMER J. POOLE and STEPHEN E. CoUoH, citizens of theUnited.

States of America residing at Springfield, in the county of l-Iampdenand Commonwealth of Massachusetts, have invented cer-v tain new anduseful Improvements ,in Devices for Grinding Contact Points, of whichthe following is a specification.

, This invention relates to improvements in devices for grindingortrueing the contact the distributor buttons or plates ignition systemswhich-are used for igniting the charge in internal combustion engines. 1

Broadly, the invention discloses the use points and of electrical of'abase plate or receiving platform, adapted to be adjusted to anysuitable height and for receiving the jig or blockon which the contactpoints are placed, whereby when the base piece or platform is movedupward, the

I the manner of adjusting the front and rear edges of the supportingplatform or plate.

contact pointsare brought against the surface of a grindingor'trueingwheeL. It is well known that the contact points are composed of veryhard material, as tungsten steel, which cannot be accurately truedwith afile.

An object of the invention is to provide jigs-for holding andreceivingthe fixed and movable contact points of variousignition systems, asDelco, Atwater Kent, Ford. Remy, Connecticut, etc., but all capable ofbein' used in connection with one common grin ing wheel.

Referring to the drawin s:

Fig. 1' is a planview 6 the jig-receiving platform showing an electricmotor, a'grinding wheel, the upper surface of the platform, and indotted lines the means for adjusting the platform. A

Fig. 2 is a side elevational view of Fig. 1, showing the device as used,the wheel being shown in the act of grinding the contacts, also themeans for accurately raising and lowering the jigs. v

Fig. 3 is a side elevational view partly in section on the line 3-3'iofFig. 1,;showing clearly Fig. 4 is a detail view of one of the jig blocksfor receiving the fixed contact points I of the make and .break devicesand the distributor button. i Fig. 5 is a perspective detail view of thejig device forreceiving andholchng the con- 1920. Serial No. 383,875

tact points of the well-known Atwater Kent system. I

Fig. 6 is a erspective detail view of the block or jig or holding theflexible plates which the contact points of the Ford system are secured.

Fig. 7 is a detail view of the block or jig for receiving and holdingthe Connecticut system of ignition. Fig. 8 is a detail view 0 the jig orblock for holding the Remy contact points. Fig. 9 is the blockforreceivmg and hold ingl the contact points of the Delco svstem. eferrmgto the drawings in detail: The base member on which theverticallyadjustable plate is mounted, is indicated at 1. This member is providedat the front edge thereof with a threaded bolt 2, a nut 3 for rais- .ingor lowering the bolt, and the jig-receiv- 1ng platform 4 to which it isattached at its" upper end, as indicated at 5. I The rear edge of theplate 4 is pivotally connected to the two rods 6 as indicated at 4' and4 which are formed with the openings 7 for receivlng an adjusting pin 8,whereby the height of the rods 6 and the plate. 4 may be easily varied.The upper ends of these rods are connected to the plate 4 by means ofthe pintle 9 which passes through openings in the rods 6 and ears 10 onthe plate. A suitable electric motor is indicated at 11, the shaft ofwhich is shown at 12. To the outer end is secured the grindingiwheel 13.This 7 wheel is located in a suitable case 14 for puron and'ofi from themotor is indicated 'at 16.

Referring now to Fig. 4 which illustrates the jig or block for holdingthe contact points and "the distributor button while hemg ound.-This'block-comprises the base portlon 17, the'integral upright member 18formed with the threaded openings 19.

These openings are for the purpose of receivingthe usual fixed make andbreak contact points 20 against which the contact point of the usualmovable arm strikes. This point is threaded into either one of theopenings 19 and is locked in position by means of the nut 21. 22is anopening in the up-" right portion 18 for receiving the distributorbutton 23. To grind these points the jig or block .17 is placed on theadjustable latform 4, as shown in Fig. 3. The plat orm is then raised tothe desired height so that the points 20 and button 23 barely strlke theperiphery or the grindingwheel 13. The operator then moves the block 17back and forth under the wheel by sliding the block on the platform 4.This platform is accurately raised or adjusted by means of the graduatednut 3. The amount thatthe wheel 3 is rotated is indicated by the pointer24.

' Referring now to Fig. 5 which is a jig or biock having aplatformportion 25, an upright member 26. In this member 1s an opening 27 toreceive the contact point 28 which is to be ground and which is clampedin the opening 27 by means of the set-screw 29. The opposite end of theplatform 18 formed with an. upright member 30 hav ng an inclined portion31 and a iedge portion 32 in which is secured the threaded p111 33. Thespring contact plate indicated at 341:; placed on thefportions 31 and32. The U- shaped end .35 is placed over and against the pin 33. Alsoplaced over thispm IS the U-shaped piece 36 and the whole is thensecured together by means of the nut 37. For the purpose of holding thecontact point 38 in rigid position while being ground, a wedge shapedblock 39 is slipped or pushed into the opening 40. The jig or block isnow placed on the adjustable platform 4 and the contact points 28 and 38are ground in the manner alread described. This jig structure is forreceiving and holding the contact points of the Atwater Kent system.Referring to Fig. 6, the jig or block is indicated as a whole by thenumeral 41. It 'is formed with' two upright portions 42 and 43. Theportion 42 formed with a flat surface 44 and two; spacedblock pieces 45having the space 46therebetween. 47 and48 are upwardly extending pins toreceive the openings 49 and 50"i11'the plate 51 on which is located thecontact point 52. A late 53 also fits over the pins 47 and .48 an a nut,(not shown) isthen threadedonto the pm 48 to retain the plate 51rigidly in place on the block 42. Forthe purpose of attaching the otherpart of the make and break device, as indicated at 54, with the contactpoint 55 which is located on the spring plate 56, two

upwardly extending threaded pins 55" are is placedupon the upper surface58 of thelocated on the upper end of the part 43 to receive the openings57 of the plate 54, which part 43' and between the spaced pieces "59 andsecured in lace by threading nuts onto the pins 55. T 0 twocontact-points 52 and 55 may therefore be ground by placing the block orjig 41 on the adjustable platform 4 and then grinding them I as alreadyde-- scribed. This jig is used for grindin' the make and break pointswhichare use for' the Ford ignition s stemzf, I

. Fig. 7,, showsa b 001: 0 jig which/isused 5 Whatwe claim is: 11'. A,jig. or block member p v. "holding the contact points of. an 1 smi hs-ma l W 8 31 8 4 in the Connecticut system of electrical ig-' nition. 60designates the base part, 61 the upright having the opening 62 toreceive the v fixed contact point 63'. 64 designates a U- shaped piecethat is secured to the part 81- by means of the screws 65. 66 is a plateusual arc-shaped piece which is placed on the pin 88 and theroller 68 inthe recessed part 69. The contact points 63 and 70 are then ground asalready described.

Fig.8 represents the jig or block for grinding the contact points of theRemy systom. '21 is the base-piece, 72. and 73 the integral uprightportions. The portion 72 is formed with an opening 72' therein, forreceiving the pin 78 of the arm 74. The part 74 of the arm rests in therecess 75 of the part 7 3 whereby the contact point 76 is rigidly heldin place for grinding. The other contact oint 7 8 is threaded into theopening 78' and t en locked in place with the nut 80. The whole is thenplaced on the adjustable platform 4 for grinding.

Fig. 9 shows a jlg or block for grinding the contact points of theso-called Delcc system of ignition. 81 designateslthe base piece havingthe upwardly extending portions 82, 83, and 84. The portion 82 1sprovided with a pin 82 to receive the opening '85 of the breaker arm orlever 86 having passed through the openings 84' and 84 to retain the armin place. 90 designates a blo k that 1s placed in the space 91 and whichrests 1n the notched recesses 92 to prevent the point 93 from beingdepressed or bent downwardly while being ground.

It will be seen from this description that we have produced a device ormechanism for accurately and rapidly grinding the makeand break contactpoints of electrical ignition" systems of various types or forms.

It should be observed that the upright or extension portions ini'whichthe contacts, distributor. buttons, and the movable arm are placed, areall of substantially equal distancesdrom the bottom of the base piece,whereby the grinding will be uniform on all of the contacts, buttons,and the contact on the movable arm. The contact supportedfwhile'beingground; j 4

for temporarily 'tion system whlle' being ground, said bloc comthat isalso secured to the piece 64. 67 is the art of the movable arm isdirectly and-rigi y I" I prising a base-piece having a raised portionwith openings therein to receive the usual fixed contact points and thedistributor button, and another raised portionspaced from the fixedcontact receiving portions and adapted to receive the movable member ofthe contact device.

2. A device for temporarily holding and retaining the contact points ofan ignition system while being ground and comprising a block formed withspaced upwardly extending channeled portions to receive said points, asdescribe a 3. A device for the purpose described comprising abase-portion with spaced integral uprights having openings therein toreceive and retain the fixed contacts, and means including otheruprights to receive the movable contact carrying members, whereby bothof said contacts may be simultaneously ground while so held or retained.

4. A jig or block device for the purpose described, having recessed orgrooved upwardly extending portions to receive a movable contactcarrying arm, and pin devices in the extension for retaining said arm inthe grooved or recessed portions.

'5. A jig or block device formed with a base piece and an upright orextension part having 0 enings therein to receive and retain in p aceignition contact points while being ground, as described.

6. A jig device for holding electrical contact points, distributorbuttons and the contact pointon the movable member of ignition systemswhile being ground, said device including a base part and spacedextension pieces to receive the points, buttons, and movable member,said pleces being substantially an equal distance from the baseart,whereby the grinding operation will e of uniform character.

A HOMER J. POOLE.

STEPHEN E. COUCH.

